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WITHDRAWN Dynamic Characteristics Assessment and 3D Site Effects Analyses of Earth Dams Based on Ambient Noise Measurements.

Description: 

WITHDRAWN The HVSR method has undergone a great evolution for the evaluation of dynamic parameters in free-field condition. Its application for more complex systems, i.e. 2D and 3D systems, is under development but much less widespread. This paper presents case studies applied to a large dam built in a narrow valley and dikes built on very thick deposits, very complex sites.

As part of the study, sets of ambient noise measurements were acquired for each earth structure using six velocimeters, aiming to evaluate the possible 3D site effects and determine the fn values. Analyses of these experimental data consisted of processing the individual signals with the simple “reference dependent spectral” and “ambient vibration horizontal-to-vertical spectral ratio (HVSR)” methods. Modal analysis combining synchronized measurements led to the establishment of additional higher vibration frequency modes and modal shapes. The consistency between the f_n values obtained using the simple methods and those from the advanced modal analysis are noticeable.

For the large dam, the seismic data provided an exceptional opportunity to validate the experimental data. A comprehensive analysis was thus conducted to compare the dynamic parameters calculated from the processed experimental data with those resulting from the seismic data and proved the values to be similar. All of these analyses demonstrate the potential of the ambient noise technique for identifying the dynamic characteristics of large earth structure built in narrow valleys or on very thick deposits.

Session: Single-station Passive Exploration Methods: Status and Perspectives [Poster]

Type: Poster

Date: 4/18/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Daniel Verret

Student Presenter: No

Invited Presentation: 

Authors